linux-kernel - Re: Linux 6.6-rc3 (DEBUG_VIRTUAL is unhappy on x86)

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Message-ID: <ccfe98b1-7179-45bb-bc6e-8d921c042eec@leemhuis.info>
Date:   Sun, 1 Oct 2023 14:24:20 +0200
From:   "Linux regression tracking #adding (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Kaplan <David.Kaplan@....com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        x86@...nel.org
Subject: Re: Linux 6.6-rc3 (DEBUG_VIRTUAL is unhappy on x86)

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 30.09.23 18:26, Hyeonggon Yoo wrote:
> 
> [...]
> 
>> Peter Zijlstra (1):
>>       x86,static_call: Fix static-call vs return-thunk
> 
> Hello, the commit above caused a crash on x86 kernel with
> CONFIG_DEBUG_VIRTUAL=y.
> 
> The compiler version is gcc (GCC) 13.2.1 20230728 (Red Hat 13.2.1-1),
> and below are dmesg (raw), dmesg (decoded), git bisect log,
> and the configuration used.
> 
> I'm not sure if it would lead to an unwelcome surprise, because
> vmalloc_to_page(any valid kernel address) should work anyway.
> But it seems that by some reason, while updating kernel code,
> the kernel confuses kernel text area with vmalloc/module area.
> 
> Should be an x86-specific issue.

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced aee9d30b9744d6775
#regzbot title x86,static_call: crash on x86 kernel with
CONFIG_DEBUG_VIRTUAL=y.
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.